linux-kernel - Re: One bug of SDHCI driver

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Message-ID: <86zjgcjckz.fsf@void.printf.net>
Date:	Mon, 14 Jul 2014 14:26:36 +0100
From:	Chris Ball <chris@...ntf.net>
To:	"Fu\, Zhonghui" <zhonghui.fu@...ux.intel.com>
Cc:	Jaehoon Chung <jh80.chung@...sung.com>, ulf.hansson@...aro.org,
	tgih.jun@...sung.com, aaron.lu@...el.com,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	jackey.shen@....com, gregkh@...uxfoundation.org
Subject: Re: One bug of SDHCI driver

Hi Zhonghui,

On Tue, Jul 08 2014, Fu, Zhonghui wrote:
> Why add "mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;" ?  How to fix this bug?
>
> Could you please give out some idea about this bug?

Jaehoon already gave you a patch to fix this bug.  Here it is again in
proper patch form.  Please can you test it and let us know whether it
fixes the crash?  Thanks.


From: Chris Ball <chris@...ntf.net>
Subject: [PATCH] mmc: core: sdio: Fix unconditional wake_up_process() on sdio thread

781e989cf59 ("mmc: sdhci: convert to new SDIO IRQ handling") and
bf3b5ec66bd ("mmc: sdio_irq: rework sdio irq handling") disabled
the use of our own custom threaded IRQ handler, but left in an
unconditional wake_up_process() on that handler at resume-time.

Reported-by: Fu, Zhonghui <zhonghui.fu@...ux.intel.com>
[Patch suggested by Jaehoon Chung]
Signed-off-by: Chris Ball <chris@...ntf.net>
---
 drivers/mmc/core/sdio.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index e636d9e..2a128e2 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -992,7 +992,8 @@ static int mmc_sdio_resume(struct mmc_host *host)
 		}
 	}
 
-	if (!err && host->sdio_irqs)
+	if (!err && host->sdio_irqs &&
+	    !(host->quirks & MMC_CAP2_SDIO_IRQ_NOTHREAD))
 		wake_up_process(host->sdio_irq_thread);
 	mmc_release_host(host);
 
-- 
Chris Ball   <http://printf.net/>
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